Optimized Design Parameters for Welded TMCP Steels,
1997
Malik, L. | Yee, R. | Graville, B. | Dinovitzer, A.
In this report, data on the static strength, toughness, and fatigue properties of accelerated cooled TMCP steels and their weldments have been compiled from various sources. Potential for advantageous application in ship structure design has been examined. Fabrication characteristics of the TMCP steels, mainly weldability and line heating, are also briefly reviewed. Tensile test data indicates that the yield to tensile ratio of the accelerated cooled TMCP steels tends to be slightly higher than steels produced by other steelmaking routes. Accelerated cooled TMCP steels possess excellent toughness and should easily meet toughness requirements to prevent brittle fracture in ships at a design temperature of 0C. In addition, TMCP steels have better weldability and HAZ toughness. As a result, accelerated cooled TMCP steels allow for more economic fabrication and greater weld joint integrity as they are more likely to have an economic edge for yield strengths up to 500 MPa and plate thicknesses up to 50 mm. Classification Societies have recently introduced explicit fatigue design criteria for welded joints in ships. These criteria are however largely based on S-N data for basic welded joints fabricated from non-TMCP steels. Available S-N data for as-welded joints fabricated from accelerated cooled TMCP steels indicates that these joints share similar characteristics, and that there is no significant difference between high cycle fatigue strengths of as-welded joints fabricated from non-TMCP steels and accelerated TMCP steels, even if soft HAZs are present in the TMCP steel joints.
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